T5744 查看數據表（PDF） - Atmel Corporation

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T5744

UHF ASK/FSK Receiver

Atmel Corporation 

T5744

Figure 5 shows a typical input matching network for fRF = 315 MHz and fRF =

433.92 MHz using a SAW. Figure 6 illustrates the input matching to 50 W without a

SAW. The input matching networks shown in Figure 6 are the reference networks for the

parameters given in the electrical characteristics.

Table 1. Calculation of LO and IF Frequency

Conditions

fRF = 315 MHz, MODE = 0

fRF = 433.92 MHz, MODE = 1

Local Oscillator Frequency

fLO = 314 MHz

fLO = 432.92 MHz

300 MHz < fRF < 365 MHz, MODE = 0

fLO

=

------f--R----F-------

1 + ----1-----

314

365 MHz < fRF < 450 MHz, MODE = 1

fLO

=

----------f--R----F-----------

1 + --------1---------

432.92

Intermediate Frequency

fIF = 1 MHz

fIF = 1 MHz

fIF

=

-f--L---O---

314

fIF

=

-----f--L---O-------

432.92

Figure 5. Input Matching Network with SAW Filter

8 LNAGND

T5744

C3

L

9

LNA_IN

22p

25n

fRF = 433.92 MHz

C16

C17

100p

L3

27n

8.2p

TOKO LL2012

F27NJ

RFIN

L2

TOKO LL2012

F33NJ

1 IN

B3555

5

OUT

C2

33n

2 IN_GND

OUT_GND 6

CASE_GND

8.2p

3,4 7,8

8 LNAGND

T5744

C3

L

9

LNA_IN

47p

25n

fRF = 315 MHz

C16

C17

100p

L3

47n

22p

TOKO LL2012

F47NJ

L2

RFIN

TOKO LL2012

F82NJ

1 IN

B3551

5

OUT

C2

82n

2 IN_GND

OUT_GND 6

CASE_GND

10p

3,4 7,8

5

4521B–RKE–01/03

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